.shell {
  position: relative;
  isolation: isolate;
  background: #080a12;
}

.shell::before,
.shell::after {
  position: fixed;
  inset: 0;
  z-index: -1;
  content: "";
}

.shell::before {
  background: url("/partyapp-background.jpg") center 42% / cover no-repeat;
}

.shell::after {
  background:
    linear-gradient(90deg, rgba(5, 6, 13, .42), rgba(5, 6, 13, .64) 48%, rgba(5, 6, 13, .88)),
    linear-gradient(0deg, rgba(5, 6, 13, .52), transparent 55%);
}